Tombs of Han Dynasty (206 BC–220 AD) are found at the construction site of Beijing's second administrative center in suburban Tongzhou, March 13, 2016. Archaeologists suspect the tombs were robbed and security measures have been bolstered as excavation is going on. Beijing is building a subsidiary administrative center in Tongzhou in a bid to cure "urban ills," including overpopulation, traffic congestion and smog. It is expected to relocate about 400,000 residents from the city center to the suburban district. [Photo/IC]